800=x+2/3x

Solution for 800=x+2/3x equation:

800=x+2/3x

We move all terms to the left:

800-(x+2/3x)=0


Domain of the equation: 3x)!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

-(+x+2/3x)+800=0

We get rid of parentheses

-x-2/3x+800=0

We multiply all the terms by the denominator


-x*3x+800*3x-2=0

Wy multiply elements

-3x^2+2400x-2=0

a = -3; b = 2400; c = -2;
Δ = b2-4ac
Δ = 24002-4·(-3)·(-2)
Δ = 5759976
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{5759976}=\sqrt{4*1439994}=\sqrt{4}*\sqrt{1439994}=2\sqrt{1439994}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2400)-2\sqrt{1439994}}{2*-3}=\frac{-2400-2\sqrt{1439994}}{-6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2400)+2\sqrt{1439994}}{2*-3}=\frac{-2400+2\sqrt{1439994}}{-6}
$